M2.8 Earthquake near Adak, Alaska — 16 June 2026
A minor earthquake of magnitude 2.8 was recorded near Adak, Alaska on , with an epicentre 252 km west of Adak, at a focal depth of 74.5 km.
Time (UTC): 2026-06-16 00:25:28
Time (your timezone): —
Magnitude: 2.8 (minor)
Focal depth: 74.5 km (intermediate)
Epicentre: 51.5190, 179.7590
Location: 252 km W of Adak, Alaska
USGS link to NOAA tsunami information: Not linked
Review status: Reviewed
Source: USGS event page
How strong was this earthquake?
Minor earthquakes in this range are felt by people close to the epicentre as a brief jolt or rattle, but they very rarely cause any damage.
A magnitude 2.8 earthquake radiates roughly 239 kg of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 121, which is below the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.
Where was the epicentre?
The epicentre was located at 51.5190, 179.7590 — 252 km west of Adak. The closest other recorded event was a magnitude 3.4 earthquake 3 km west-northwest of here on 11 June 2026.
Why the 74 km depth matters
At 74 km this was an intermediate-depth earthquake. Energy from events at this depth spreads out before it reaches the surface, which usually means weaker shaking near the epicentre than a shallow quake of the same magnitude, but shaking felt across a wider area.
This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size may be noticed locally, especially close to the epicentre. Its intermediate depth normally reduces peak shaking near the epicentre compared with a shallow event of the same magnitude.
What does the tsunami information flag mean?
The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M2.8 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.
How earthquakes generate tsunamis, and what the alert levels mean →
Aftershocks and local seismic history
4 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.1.
45 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.9 event near Adak on 28 August 2025. This M2.8 event released about 44,668 times less energy than that event.
How long aftershock sequences last, and how large they get →
Where this event sits in the record
This earthquake is part of the June 2026 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M3.4 earthquake near Adak, Alaska — (3 km WNW)
- M2.0 earthquake near Adak, Alaska — (21 km NNE)
- M2.3 earthquake near Adak, Alaska — (30 km WSW)
- M3.1 earthquake near Adak, Alaska — (39 km S)
- M1.4 earthquake near Adak, Alaska — (41 km NNW)
- M2.8 earthquake near Adak, Alaska — (45 km NNW)
- M0.7 earthquake near Adak, Alaska — (45 km NNW)
- M4.1 earthquake near Adak, Alaska — (45 km S)
- M1.8 earthquake near Adak, Alaska — (46 km NNW)
- M2.9 earthquake near Adak, Alaska — (46 km N)
Other magnitude 2 earthquakes worldwide
- M2.8 earthquake near Wilkerson, CA —
- M2.5 earthquake near Ninilchik, Alaska —
- M3.0 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M2.7 earthquake near Point Possession, Alaska —
- M2.6 earthquake near Mina, Nevada —
- M2.7 earthquake near Cloverdale, CA —
- M2.5 earthquake near Skwentna, Alaska —
- M2.5 earthquake near Chickaloon, Alaska —
Questions about this earthquake
How strong is a magnitude 2.8 earthquake?
Minor earthquakes in this range are felt by people close to the epicentre as a brief jolt or rattle, but they very rarely cause any damage. A magnitude 2.8 earthquake radiates roughly 239 kg of TNT equivalent in seismic energy.
How deep was the earthquake near Adak?
At 74 km this was an intermediate-depth earthquake. Energy from events at this depth spreads out before it reaches the surface, which usually means weaker shaking near the epicentre than a shallow quake of the same magnitude, but shaking felt across a wider area.
Was the M2.8 earthquake near Adak felt?
This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size may be noticed locally, especially close to the epicentre. Its intermediate depth normally reduces peak shaking near the epicentre compared with a shallow event of the same magnitude.
What does the USGS tsunami field mean for this event?
The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M2.8 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.
Have there been aftershocks?
4 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.1.
How often do earthquakes happen near Adak?
45 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.9 event near Adak on 28 August 2025. This M2.8 event released about 44,668 times less energy than that event.